Combine the cheese, onion, sour cream, mayonnaise, egg, vinegar, mustard, garlic, salt, thyme, marjoram, basil, celery salt, and white pepper in a blender.
2 Blend until thick and very smooth.
3 Chill before serving to allow the flavors to develop.
Note
For a chunkier dressing, blend half of the cheese with the remaining ingredients, then fold in the remaining crumbled cheese.
Keywords:
blue cheese dressing, Roquefort, sour cream, mayonnaise, Dijon mustard, creamy dressing